This error message is from deep in the bowels of Windows, indicating a possible problem with a network card or video card, or problem with the data (as mentioned by Robin).

You mention that you cannot add information. Are you talking about transactions, or clients or dockets or does the addition of anything fail (which would indicate that your network card is having trouble "writing" to the network).

Have you changed anything from a hardware or software point of view recently? If you go to another computer, does the same thing happen? If you copy the data to your local hard disk, does the same thing happen?

Something has changed, or you have a hardware component that has decided it doesn't want to work in the summer heat...

PS - I haven't forgotten the promised call, and will make it next week.

Regards